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Planning Commission <br />January 9, 2008 <br />Page Two <br />Drainage Calculations <br />1. Pipe sizing calculations should be submitted for the proposed storm sewer. <br />2. The 10 -year rainfall event should use 4.2- inches of rain. Please update the Hydro CAD <br />calculations. <br />Preliminary Plat <br />1. Additional drainage and utility easement should be provided on Lot 6. It also appears as <br />if the drainage from Lot 7 will be across Lot 6. This drainage area should be covered by <br />the easement. <br />Miscellaneous <br />1. A Stormwater Pollution Prevention Plan should be submitted for review and approval. <br />2. All required permits should be provided including the Watershed Permit, Minnesota <br />Department of Health, and Minnesota Pollution Control Permit for the sanitary sewer <br />extension. <br />The above comments should be addressed and plans should be resubmitted for review. If you <br />have any questions concerning this information, please call me at (763) 780 -0450 ext. 13. <br />Sincerely, <br />Elfering & Associates <br />Lee Elfering, P.E <br />City Engineer <br />2 <br />Z: \PROJ \120101E - Whispering Pines \ltr - 010908- PC.doc <br />